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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income	$ 291,703	$ 262,290	$ 313,404
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	109,297	103,248	69,795
Stock-based compensation expense	25,315	21,287	20,813
Deferred income taxes	(5,299)	(67,423)	(10,228)
Loss on disposal of property, plant and equipment	898	1,907	232
Changes in operating assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(54,611)	(68,676)	19,728
Inventories	(108,883)	(8,955)	45,340
Accounts payable	48,763	(91,722)	(18,932)
Accrued income taxes	7,880	47,644	(11,759)
Accrued liabilities and customer deposits	31,744	(18,891)	(11,338)
Other assets and liabilities	(32,136)	8,102	33,475
Net cash provided by operating activities	314,671	188,811	450,530
Investing Activities
Purchase of property, plant and equipment	(93,305)	(89,466)	(50,216)
Proceeds from disposal of property, plant and equipment	11,293	1,291	363
Acquisitions of business, net of cash acquired	(51,153)	(945,299)	(183,113)
Other	(14,122)	0	0
Net cash used for investing activities	(147,287)	(1,033,474)	(232,966)
Financing Activities
Proceeds from debt, net of issuance costs	3,480,702	1,216,740	1,875,000
Payments of debt	(1,453,954)	(1,269,537)	(1,102,748)
Stock re-purchase	0	0	(212,176)
Proceeds from exercise of stock options and other benefit plans	9,962	4,428	1,983
Payment of income tax withholding on share-based compensation	(12,322)	(6,844)	(6,658)
Cash dividends	(46,277)	(42,218)	(32,430)
Net cash provided by (used for) financing activities	1,978,111	(97,431)	522,971
Effect of changes in currency exchange rates	(36,542)	32,263	(26,436)
Increase (decrease) in cash	2,108,953	(909,831)	714,099
Cash, cash equivalents and restricted cash, beginning of year	233,401	1,143,232	429,133
Cash, cash equivalents and restricted cash, end of year	$ 2,342,354	$ 233,401	$ 1,143,232

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